[Raudi]

Thankyou so much Raudi. I want the cheapest build possible. the cheaper the better. the only thing I will be doing is running xbmc and stream through addons nothing else. I think I can get the Ram sorted and the storage. But im confused with the power supply thing. the board I was going to go for was
Gigabyte J1800N-D2H which can be brought for £49
the Biostar J1800NH2 is going for around £48. this board seems to be not much stocked in the UK its mainly from outside england in europe so I dont want to pay vat and tax on top. Out of these boards which is better.

The Gigabyte seems to be more known and even in htis thread they are endorssing it. (thats what got my attention) now the only thing that I'm unsure of is the power supply. Since the only thing attached will be a USB3 for boot. the Ram and maybe a wifi adapter. I will proberly need the cheapest adaptor I can get right.

I mean the thing draws 10watt max. so I wont need anything like 60w adaptor? confused around the power supply. Thankyou so much for helping me with my first build.

One last thing It needs to be completety silent. no fan anywhere. cant I just stick a laptop adaptor in somewhere?

EDIT: just read that if you buy within EU then there is no import tax or vat. So I might consider the Biostar J1800NH2. what are other peoples opionions will it be good enough for my needs or is the Gigabyte worth the extra £5-£10

It doesn't really matter whether you choose one board or another in your case. Just use the cheapest one.
As for the power supply: You don't need the 60W, but it's hard to find something with less power
And if you include the 12V external power supply you would need, a case including a PSU is only slightly more expensive than some kind of pico PSU without a case. So I would recommend a case with built in PSU. At least here for me in Germany it is much cheaper that way.